Cute cats!
Would maybe try to add some backgrounds and maybe some music/sound effects (for example, for when you find the cat or when you choose the incorrect one, as I feel there's not many feedback for the player when you choose the wrong cat) ! And also try to add progressive difficulty too!
Also, If you can add a pause and also a start menu so that the game "looks" better, even if it's a really simple one.
And a thing I noticed is that the game does not work if the screen is not in full screen mode (like, the game works, but the cats just spawn out of the screen limits sometimes).
Congrats on your game!